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Metals VI

Riddle

Surface mining versus Underground mining. Technologies for spanish speakers.

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Recommended age: 13 years old
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Metals VIOnline version

Surface mining versus Underground mining. Technologies for spanish speakers.

by tekno TEKNESO
1

Thismethod is much less common, and produces, for example, 15% of minerals in the United States

Hints

This method requires horizontal, diagonal or vertical accesses

This method is more expensive than the other

This method generates more risks to workers than the other

It consists of digging tunnels or shafts into the earth to reach buried ore deposits

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